TY  - BOOK
AU  - Kavitha K 
AU  - Meenakumari K S (Guide)
TI  - Management Of Damping Off And Improvement Of Growth In Chilli With Native Species Of Arbuscular Mycorrhizae
U1  - 632.3 
PY  - 2001///
CY  - Vellayani 
PB  - Department of Plant Pathology, College of Agriculture 
N2  - Management of damping off, the most destructive disease of chilli both 
111 nursery and main field incited by Pythium aphanidermatum (Edson) Fitz. 
using native AMF was attempted in the present investigation. Out of nine 
native AMF and one identified culture (Glomus mosseae) screened, the 
cultures Ms and M9 were found effective for suppression of damping off and 
growth improvement in chilli. 
Application of AMF inoculum in the nursery furrows along with chilli 
seeds was very effective for rapid and easy colonization of AMF. Likewise 
application of AMF inoculum at the rate of 850 g m-2 was selected as the 
economic dose for achieving satisfactory colonization of AMF. 
Azospirillum spp. were isolated from chilli roots collected from 
different locations of Thiruvananthapuram district. The in vitro nitrogen 
fixing capacity of the isolates ranged between 11.2 and 20 mg N s' of malate 
and IAA production between 21 and 55 ug mrl. Six best isolates which 
performed well under in vitro screening were selected an-d subjected to in vivo 
screening for growth, biomass production and yield in chilli. The isolates 
Az-l and Az-2 which performed well both under in vitro and in vivo 
screening were selected for further studies. Based on the characterization 
studies it was found that the isolate Az-l is related to Azospirillum lipoJerum 
and Az-2 is similar to Azospirillum brasilense. The isolate Az-l grew well at 
pH 5,6 and 7 whereas the isolate Az-2 grew well at pH 6 and 7. 
 
In the study on the interaction of native AMF and Azospirillum on 
damping off disease suppression, pre-inoculation of chilli seedlings with M9 
culture alone recorded the least disease incidence. Eventhough dual 
inoculation of AMF and Azospirillum could suppress the damping off, 
Azospirillum had no direct effect on disease suppression. However dual 
inoculation of AMF and Azospirillum (M9A2PO) significantly increased the 
growth, biomass production and yield in chilli. The present study forms the 
first report of the synergistic effect of AMF and Azospirillum for the 
management of damping off and growth improvement in chilli. 
The present investigation emphasizes the importance of pre-inoculation 
of AMF in the chilli nursery as a prophylatic measure to prevent pathogen 
attack. The technology of combined inoculation of AMF and Azospirillum 
could be recommended for adoption by the vegetable farmers. Eventhough the 
present study was carried out in chilli, the same cultures could be 
recommended for all transplanted solanaceous vegetables after confirming the 
results through field trials. 


UR  - http://krishikosh.egranth.ac.in/handle/1/5810104596
ER  -